Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ead4fe08052a17b…

MALICIOUS

PDF

75.7 KB Created: 2021-10-07 13:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd65090e6d1ad7c1ce1d77d0dad5206c SHA-1: 6f0934c1746078fb9c35d595f60c102d8d53d1c3 SHA-256: 5ead4fe08052a17bb4de0900aa20c852fea2ce330825f3fb19821302f1ed4dbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=40+kg+to+stones+and+pounds PDF link annotation
    • https://organicfertilizerproduction.com/d/files/13406863666.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/vexejek.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/81601513143.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1c3d0ca8c590ae65844091e7efedf99e/lebifojujawadojoz.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/susul.pdfIn PDF document text
    • https://12shio4.com/contents/files/6098636767.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/19554440173.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/wodikugulopi.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090809471073499.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/5761175529.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/69926917719.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jj7dfl5bo2onj8lbm21jk741hu/bubes.pdfIn PDF document text
    • https://italvaping.com/file/29001247407.pdfIn PDF document text
    • http://momsystem.ru/public/file/fadapemewowuxorulo.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/96957212290.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138017c07575---53868536583.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/nokunofapujupodexu.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/44108393226.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/vasosemivadapixe.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/jujoni.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ptnoavim7jqu7k498utgv9psi5/daziparunixiwoziluzaw.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210908_76617CAAF1DE7F41.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 10624 bytes
SHA-256: 118f5342a4c795ec7c39ce4517e42515a41f0791fe7d84a74eaf92d25d46474e
font_01_sfnt_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 17808 bytes
SHA-256: 7baafa2848b496d8ed1967ff30a06e25626bc2ade36e91d9aae8b953b94f0688